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1、GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March04,2010 OperationManual GT8550ASeriesUSBPowerSensors RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensor

2、s OperationManual,PartNumber34780,March04,2010 Alltechnicaldataandspecificationsinthispublicationaresubjecttochangewithoutpriornoticeanddo notrepresentacommitmentonthepartofGigatronics,Incorporated. 2009GigatronicsIncorporated.Allrightsreserved.PrintedintheU.S.A. CONTACTINFORMATION Gigatronics,Incor

3、porated 4650NorrisCanyonRoad SanRamon,California94583 Telephone:800.726.4442(onlywithintheUnitedStates) 925.328.4650 Fax:925.328.4700 OntheInternet: Warranty GigatronicsGT8550ASeriesUSBPowerSensorsarewarranted againstdefectivematerialsandworkmanshipforoneyearfrom dateofshipment.Gigatronicswillatitso

4、ptionrepairorreplace productsthatareprovendefectiveduringthewarrantyperiod. ThiswarrantyDOESNOTcoverdamageresultingfromimproper use,norworkmanshipotherthanGigatronicsservice.Thereis noimpliedwarrantyoffitnessforaparticularpurpose,noris Gigatronicsliableforanyconsequentialdamages.Specification andpri

5、cechangeprivilegesarereservedbyGigatronics. RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 Regulatory compliance information This product complies with the essential requirements of the following applicable European Directives, and carries

6、 the CE mark accordingly. 89/336/EEC and 73/23/EEC EMC Directive and Low Voltage Directive EN61010-1 (1993) Electrical Safety EN61326-1 (1997) EMC Emissions and Immunity Manufacturers Name: Manufacturers Address Giga-tronics, Incorporated 4650 Norris Canyon Road San Ramon, California 94583 U.S.A. Ty

7、pe of Equipment: Model Series Number USB Power Sensor GT-8550A Model Numbers: GT-8551A, GT-8552A, GT-8553A, and GT-8888A DeclarationofConformityonfile.ContactGigatronicsatthefollowing; Gigatronics,Incorporated 4650NorrisCanyonRoad SanRamon,California94583 Telephone:800.726.4442(onlywithintheUnitedSt

8、ates) 925.328.4650 Fax:925.328.4700 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March04,2010 Record of Changes to This Manual Usethetablebelowtomaintainapermanentrecordofchangestothisdocument.Corrected replacementpagesareissuedasTechnicalPublicationChangeInstructions(TCPI

9、).Whenyouareissued aTCPI,dothefollowing: 1. InserttheTCPIatthefrontofthemanualbinder. 2. RemovethepagesfromthemanualbinderthatarenotedintheTCPI. 3. Replacethepage(s)removedinthepreviousstepwiththecorrectedpage(s). 4. Recordthechangesinthetablebelow. TPCINumberTPCIIssueDateDateEnteredComments Gigatro

10、nicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 I TableofContents 1SafetyandManualConventions.1 1.1ProductReference.1 1.2PersonalSafetyAlert.1 1.3EquipmentSafetyAlert.1 1.4Notes.1 2Introduction.3 2.1Overview.3 2.2SensorsintheGT8550ASeries.4 2.3ReceivingandInspection.5 2.

11、4ComputerRequirementsforMeasurementXpressSoftware.5 2.5MeasurementModes.6 2.6USBConsiderations.8 2.7InstallMeasurementXpress.9 2.8InstalltheGT8550AUSBSeriesPowerSensors.13 2.9StartMeasurementXpress.15 3UsingMeasurementXpress.17 3.1Overview.17 3.2MainAreasoftheMeasurementXpressGUI.17 3.3MenuBar .18 3

12、.4ConfiguretheGT8550AUSBSeriesPowerSensors.29 3.5MeasureCWPower.32 3.6MeasurePulsePower.33 3.7UsetheMathFunctions.35 3.7UsetheMathFunctions.37 3.8UsetheStripChartFunction.38 3.9ThePulseProfilingWindow.41 3.10UsePulseProfiling.48 4Specifications.51 4.1GeneralSpecificationsforallSensors.51 4.2SensorMe

13、asurementUncertaintyFactors.54 4.3AdditionalTechnicalSpecifications.58 GigatronicsGT8550ASeriesUSBPowerSensors IIOperationManual,PartNumber34780,March4,2010 ThispageintentionallyBlank GigatronicsGT8550ASeriesUSBPowerSensorsSafetyandManualConventions OperationManual,PartNumber34780,March4,2010 Page1

14、1 Safety and Manual Conventions Thismanualcontainsconventionsregardingsafetyandequipmentusageasdescribedbelow. 1.1 Product Reference Throughoutthismanual,theterm“GT8550A”referstoallmodelsofpowersensorswithinthe GT8550Aseries,unlessaspecificmodelpowersensorisreferenced. 1.2 Personal Safety Alert WARN

15、ING:Indicatesahazardoussituationwhich,ifnotavoided,couldresultin deathorseriousinjury. 1.3 Equipment Safety Alert CAUTION:IndicatesasituationwhichcandamageoradverselyaffecttheGT8550Aor associatedequipment. 1.4 Notes Notesaredenotedandusedasfollows: NOTE:Highlightsoramplifiesanessentialoperatingormai

16、ntenanceprocedure,practice, conditionorstatement. WARNING ! CAUTION SafetyandManualConventionsGigatronicsGT8550ASeriesUSBPowerSensors Page2OperationManual,PartNumber34780,March4,2010 Thispageisintentionallyblank. GigatronicsGT8550SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,Marc

17、h4,2010 Page3 2 Introduction 2.1 Overview NOTE:Inthismanual,theGT8550SeriesUSBPowerSensorisreferredtogenericallyasthe “GT8550A”forsimplicity.Thespecificmodelofpowersensorisusedwherenecessary. ThismanualprovidesinformationabouttheinstallationandoperationoftheGT8550ASeriesUSB PowerSensors.Productdescr

18、iption,specifications,andsupportareincluded.Changestothismanual arerecordedinRecordofChangestoThisManualinthefrontsection. TheGT8550Afeaturesaruggedbodythatconnectsdirectlytoadesktoporlaptopcomputerusinga standardUSBportandUSBcable.Aseparatepowermeterisnotrequired.TheGT8550ASeriesUSB PowerSensorsall

19、owforimmediateconversionofRFandmicrowavepowerintodigitaldatarightatthe pointofpowersensing.Thecompanionapplicationsoftware,MeasurementXpress,providesaGraphical UserInterface(GUI)tomakepowerandothermeasurements. ThebenefitsofusingMeasurementXpressare: FamiliarMicrosoftWindowsInterface Easytoreadnumbe

20、rsandbargraphs Fastupdaterateallowsrealtimecircuittuning Internalzeroandcalthesensorpowersupreadytomakemeasurements IfyouwishtoprogramtheGT8550Aforautomatedtesting,aDynamicLinkLibrary(DLL)isincludedin theUSBflashdrivethatshipswiththeGT8550A.InformationforprogrammingtheGT8550Aisfoundin theGT8550ASeri

21、esUSBPowerSensorsRemoteOperationandProgrammingManual. Sensorzeroingandmeterreferencecalibrationarenotrequired.Thisreducessetuptimeandsimplifies programming.TheGT8551AandGT8552Amodelsfeaturetriggeringcapabilities.(Refertothe Specificationschapteronpage51). Continuednextpage IntroductionGigatronicsGT8

22、550ASeriesUSBPowerSensors Page4OperationManual,PartNumber34780,March4,2010 2.1 Overview, Continued AtypicalsetupformeasuringRFpowerusingtheGT8550AisshowninFigure1below. Figure1. GT8550AMeasurementSetup 2.2 Sensors in the GT-8550A Series Table1belowliststhebasicparametersofthefourmodelsofpowersensori

23、ntheGT8550ASeries. Table1 GT8550ASeriesSensors:BasicSpecificationsandApplications Parameter SensorModel GT8551AGT8552AGT8553AGT8888A Frequency Range 100MHzto8GHz1100MHzto8GHz110MHzto18GHz10MHzto8GHz1 MeasurementsCW,Modulation BAP2 MAP2 PAP2 Crestfactor CW,Pulse PulseProfiling Markers Gating CW CW Dy

24、namicrange60to+20dBm60to+20dBm50to+20dBm60to+20dBm ApplicationsWireless communications andcomponent testingthatuse modulatedsignals. Aerospaceand defense:EW, ECM,ECCM,and radartesting FeaturesPulse Profiling Accuratepower measurementof continuouswave (CW)RFand microwavesignals Economicalpower measur

25、ementofCW signalsupto10GHz 1Operationalto10GHz 2Theseareexplainedinsection0onpage6. GT8550ASeriesUSBPowerSensor RFinput Computerwith MeasurementXpresssoftwareinstalled USBcable GigatronicsGT8550SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,March4,2010 Page5 2.3 Receiving and Insp

26、ection Uponarrival,inspectthecontentsoftheGT8550Ashippingcontainer.TheGT8550Aconsistsof: Sensor:therearefourmodelsofsensorstochoosefrom.ThesearedescribedinTable1onthe previouspage. USBcabletoconnectthesensortoacomputer(suppliedwithsensor) USBflashdrivecontaining: MeasurementXpresssoftware(thismayals

27、obedownloadedfromthewebsite ) FilestoenableprogrammingtheGT8550AUSBSeriesPowerSensor. 2.4 Computer Requirements for Measurement Xpress Software Table2belowshowstherequirementsofthecomputerusedwiththeGT8550ASeriesUSBPower Sensors. Table2 ComputerRequirementsforMeasurementXpressSoftware ParameterSpeci

28、fication TypeofcomputerIBMcompatible OperatingsystemMicrosoftWindowsXPorWindowsVista Processorspeed500MHz RAM256MB Diskspace50MB USBinterfaceUSB2.0minimum IntroductionGigatronicsGT8550ASeriesUSBPowerSensors Page6OperationManual,PartNumber34780,March4,2010 Measurement Modes Thissectionexplainsthemeas

29、urementmodeslistedinTable1onpage4. 2.4.2 ContinuousWave(CW) UseCWformeasuringunmodulatedCWRFsignals. 2.4.3 BurstAveragePower(BAP) TheBurstAveragePower(BAP)modemeasurestheaveragepowerduringanRFburst(SeeFigure2). Thismodeisveryusefulformeasurementofpulsemodulatedsignalswhicharenotflatorhave amplitudem

30、odulationduringthepulseONperiod,asinthecaseofTDMA(TimeDivisionMultiple Access)communicationssignals.Inthismode,theGT8550Arecognizesthebeginningandendofaburst ofRFpowerandtakesanaverageofthepowerduringthatburst.TheRFlevelcanvaryoverawide rangeduringtheburstaslongasitremainsaboveanoisethreshold,whichi

31、sautomaticallycalculated byMeasurementXpress.AssoonastheRFpowerdropsbelowthenoisethreshold,theRFburstis completeandallfurtherreadingsarediscardeduntilthenextburststarts. Figure2. BurstMeasurement InBAPmode,theGT8550Aautomaticallydetermineswhichportionsofthesignalareinthepulseand whicharenot.Incomput

32、ingtheaveragepower,theGT8550Ausesonlythoseportionsthatarewithin thepulse.Theresultisthat,independentofthesignalspulsedutycycle,themeteralwaysreadsthe averagepowerinthepulseorburst.AswiththePAPmode,whenmeasuringapulsemodulatedsignal with50%dutycycle,thereadingintheBAPmodewouldbe3dBhigherthanintheMAPm

33、ode. However,intheBAPmode,thesignalsdutycyclecanchangedynamicallyintimewithoutaffectingthe meterreading.InthePAPmode,thedutycyclefactormustbeenteredtomatchthedutycycleofthe pulsedsignal. NOTE:BAPModerequiresaminimumpulseonorofftimeasdeterminedbythepowersensorpulse widthspecification. GigatronicsGT85

34、50SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,March4,2010 Page7 2.4.4 ModulatedAveragePower(MAP) TheModulatedAveragePower(MAP)modemeasuresRFsignalswhichareamplitudemodulated,pulse modulated,orboth.IntheMAPmodetheGT8550AcalculatestheaverageRFpowerreceivedbythe sensoroveraperiodo

35、ftimecontrolledbythetimeconstantoftheinternaldigitalfilter.Theresultis comparabletomeasurementbyathermalpowersensor. Inthismode,the8550AmeasurestheaveragepowerofCWandmodulatedsignals,suchas: AM Twotone Multicarrier Pulsemodulation Digitalmodulation(QPSK,QAM,etc.) Forexample,ifanRFsignalispulsemodula

36、tedat50Hzwitha10%dutycycleismeasuredwiththe averagingfactorsetto128,themeasuredpowerreadingwillbe10%ofthepeakpowerduringpulseON periods.Ifthesignalismodulatedatalowpulserate(belowabout1kHz),theGT8550Awill synchronizethereadingspreciselywiththestartofapulsesothateachdisplayedreadingisaveraged overawh

37、olenumberofpulses(therearenofractionalpulsesincludedinthemeasurement).This eliminatesasignificantamountofnoisefromthereadings.However,eventhoughthefiltersettlingtime hasbeensettoalongtimeconstantof2.56seconds,theupdaterateofthereadingwillbemuchfaster; eventhefirstreadingwillbeveryclosetothefullysett

38、ledvalue. 2.4.5 PulseAveragePower(PAP) ThePulseAveragePower(PAP)modeissimilartotheMAPmode,butitmeasurespulsemodulated signalshavingaknowndutycycle.SpecifythisdutycycleandtheGT8550Awillautomaticallycorrect themeasurementssothatthedisplayedreadingsindicatethepeakRFpowerduringpulseONperiods. Forexample,whenmeasuringapulsemodulatedsignalwith50%dutycycle,MAPmodewouldgivea reading3dBlowerthanthereadingthatwouldbegiven